Stapler



FIG. 1 is a perspective view of a stapler showing my new design;

FIG. 2 is the front elevational view thereof;

FIG. 3 is the rear elevational view thereof;

FIG. 4 is a right side elevational view thereof, the side opposite being a mirror image;

FIG. 5 is the top plan view thereof; and,

FIG. 6 is the bottom view thereof. 

The ornamental design for a stapler, as shown and described. 